Looking for some advice on my 2003 Ranger XLT. Its the 4.0 V6 with an automatic trans. First of all, I got this truck from a dealer who had the flexplate replaced a few weeks before I purchased it. Anyway, I was driving to work about a month ago and I suddenly lost all power to the drivetrain. Stepping on the gas was causing the engine to rev but no power to the wheels. Had it towed to a shop where the removed the started and discovered that the flexplate was cracked again. Had the torque converter, flexplate, and bearing replaced, ended up costing about $1800. That seemed to fix the issue up until yesterday. I noticed a strange engine sound and after taking a look under the hood, it looked like the crank pulley was out of alignment/wobbly. That coupled with the fact that the engine sounded all around terrible, I took it back to the shop today where they dropped the started and found that the flexplate is cracked AGAIN!! Thats 3 flexplates in about 3 months. The shop is saying that they're not sure why this keeps happening and for the life of me I have no idea either. If anyone has any ideas I would really appreciate it!

Even if the flex plate was broken the crank pulley would still run true, unless it was bent or the bolts were loose, worse case the crank snout is bent, which would cause enough vibration to wreck the flexplate.

Also note that if you're missing alignment dowels that align the bell housing to the block. If these are missing then it can cause the flex plate to crack as the loads involved are quite large. Also you should check the crankshaft flange for run out.

But you shouldn't have any wobble on the crankshaft at all and that requires further investigation as to why it's occurring.

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